The Amulet of the Shield was a magical amulet found by Vox Machina on the body of a female dwarf in the Underdark. On the front, it bore the insignia of House Thunderbrand in sapphire. On the back, there was an inscription that read, "For Lorna, my love". The amulet would act as a Shield spell once per short or long rest.[1]
The amulet was given to Lord Thunderbrand by Vox Machina on their return to Kraghammer. His reaction to the amulet was emotional, but restrained.[2]